Personally I find it one of the easiest ways to take care of dumb DPS:-
DPS gets aggro >> Shield >> Renew >> back to cleaning nails... if DPS dies, tis own fault! I think on the new fire boss (Flamelash), he generates a pool of fire on the ground, its funny to see the DPS stand there and die despite receiving 10-15k worth of health via shield and renew.
Also handy for topping people up between mobs and making sure the tank has some healing when I have to start shielding/healing other people... although I have no doubt I could put it to better use.
One of the many reasons I prefer Priest healing to Pally healing (even though Pallys are nigh invincible in PVP as they stand)
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Why use Ambush?
Your foe is in cloth and you want to give them a nice surprise!
- Sprawl